In Deutch

 

 

 

Regulators for home heating

 

In order to save frequent trips to the basement to set the drafts on the furnace in accordance with the temperature desired for the house, various kinds of automatic draft regulators can be installed to do this work.

They are operated either by means of a thermostat or by the pressure in the furnace boiler.

Thermostat

On hot air furnaces where there is no boiler, a thermostat, placed in a convenient location in the house, is wired to an electric motor near the furnace. This motor is connected to the ash pit damper and the check damper by means of chains or rods.

The thermostat is set at a certain temperature, and when the house temperature falls below this point, the thermostat starts the motor which opens the ash pit damper and closes the check damper. When less heat is desired, the action is reversed.

This device can be used on practically any type of coal-burning furnace. To have it work correctly, the regulator should be installed by someone familiar with the equipment.

The boiler damper

The automatic damper used on boilers is somewhat different and can be adjusted by the home mechanic with little difficulty. The mechanism of this device is comparatively simple. A horizontal bar pivots on top of the boiler.

One end of the bar is attached by a chain or rod to the ash pit damper, and the other end is connected to the check damper. As the bar pivots at the middle, it opens one damper and closes the other, depending on whether it pivots forward or backward.

Underneath the horizontal bar, at the point where it pivots, is a rod operated by the pressure in the boiler. When there is no pressure the rod drops, allowing the horizontal bar to tilt backward, opening the ash pit damper and closing the check damper.

On the horizontal bar will be found one or more adjustable weights that can be moved back and forth. These serve to control the pivoting of the horizontal bar.

Adjusting

To make the first adjustment on this damper regulator, see that there is no pressure in the boiler. Move the weights so that the horizontal bar tilts to open the ash pit damper and close the check damper.

Adjust the weights so that the bar can be tilted in the other direction with only a slight pressure of the finger. Move the bar in the other direction, to be sure that the ash pit damper is fully closed and the check damper wide open. If this does not happen, it will probably be necessary to make some adjustment on the chains or rods that connect the two dampers to the horizontal bar.

Make the adjustments either by lengthening or shortening the chains or rods until any movement of the horizontal bar will affect each damper equally.

Let the bar swing back to the position in which the ash pit damper is open and the check damper is closed. Allow the fire to build up pressure in the boiler, and the small rod under the horizontal bar will be forced up, tilting the bar so that the ash pit damper is closed and the check damper is open.

This immediately retards the fire and, consequently, causes a drop in the boiler pressure. As the boiler pressure drops, the rod descends, permitting the horizontal bar to tilt back again, opening the ash pit damper and closing the check damper. This operation will continue indefinitely.

The amount of boiler pressure required to move the horizontal bar can be regulated by moving weight A. When more heat is desired and, accordingly, greater boiler pressure, move weight A away from the pivot point toward the end of the bar. A greater amount of pressure will now be necessary before the horizontal bar will pivot back to check the fire.

The normal position for the weight, or weights, will depend upon the amount of heat required to make the house comfortable in average, seasonal weather. Mark these positions on the horizontal bar so that the weights can be adjusted easily. It will be necessary to move the weights when taking out the ashes, or to bank the fire for the night.

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